[PATCH 120/437] fs/eventfd: convert to read/write iterators

[Jens Axboe]

Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
 fs/eventfd.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/eventfd.c b/fs/eventfd.c
index 9afdb722fa92..6995253a37f3 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -244,16 +244,16 @@ static ssize_t eventfd_read(struct kiocb *iocb, struct iov_iter *to)
 	return sizeof(ucnt);
 }
 
-static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t count,
-			     loff_t *ppos)
+static ssize_t eventfd_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct eventfd_ctx *ctx = file->private_data;
+	struct eventfd_ctx *ctx = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	ssize_t res;
 	__u64 ucnt;
 
 	if (count != sizeof(ucnt))
 		return -EINVAL;
-	if (copy_from_user(&ucnt, buf, sizeof(ucnt)))
+	if (!copy_from_iter_full(&ucnt, sizeof(ucnt), from))
 		return -EFAULT;
 	if (ucnt == ULLONG_MAX)
 		return -EINVAL;
@@ -261,7 +261,7 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
 	res = -EAGAIN;
 	if (ULLONG_MAX - ctx->count > ucnt)
 		res = sizeof(ucnt);
-	else if (!(file->f_flags & O_NONBLOCK)) {
+	else if (!(iocb->ki_filp->f_flags & O_NONBLOCK)) {
 		res = wait_event_interruptible_locked_irq(ctx->wqh,
 				ULLONG_MAX - ctx->count > ucnt);
 		if (!res)
@@ -306,7 +306,7 @@ static const struct file_operations eventfd_fops = {
 	.release	= eventfd_release,
 	.poll		= eventfd_poll,
 	.read_iter	= eventfd_read,
-	.write		= eventfd_write,
+	.write_iter	= eventfd_write,
 	.llseek		= noop_llseek,
 };
 
-- 
2.43.0